He is on probation for a felony, on a tether, and took off? Then there's a strong possibility that he would be looking at jail time on his return. Would he be charged with an additional offense for absconding? I doubt it; but I dont know anything about the underlying conviction or circumstances.

I don't want to intrude on your life, but consider whether this person is going to really be a positive part of your life in the future, or if he's going to be an anchor dragging you down.